Heating-Ventilation

[Max Hoepli]

If the heater core does leak. Does it leak from the radiator hose to the
core part?

The air conditioning does function, had it repaired in the summer, high
pressure line is made of copper now.


----- Original Message ----- 
From: "Doyt W. Echelberger" <doyt at buckeye-express.com>
To: "Max Hoepli" <mhoepli at vif.com>
Sent: 18, December 2005 14:22
Subject: Re: Heating-Ventilation


> At 01:39 PM 12/18/2005, you wrote:
> >Hello All!
> >
> >I have a 1986 Audi 5000 Quattro 4 door, the heating works, it becomes hot
> >inside car, though the windows can fog, especially in the back, and fogs
> >faster when there are more people inside the car. The rear defogger
> >functions, when degogger is turned off, the back light will fog, turning
> >the defogger on again, the back light will unfog. The windows have been
> >tinted. When turned on to "Auto" the vents on the left and right edges of
> >the dash will unfog side windows in the front, better that center vents
be
> >turned off to have more air exiting from the edge vents. At times I am
> >driving with a very warm front cabin with temperature showing "HI"  with
> >outside temperature of -4C but with foggy windows.
> >I wonder if the vent like slots behind the rear speakers below the back
> >light have any role in this issue of windows fogging. On the outside at
> >the bottom of C-pillar, just behind rear quarter window, there is a
> >plastic covered section, painted the same as the body, I can peek in
> >behind this vent like cover. I wonder if this has any role in the fogging
> >of windows?
> >
> >Any suggestions to the solution of this fogging?
> >
> >
> >Max
>  >>>>>>>>>>>>>>>>..
> Several things.....on a new type 44 the air conditioner works, even in the
> winter, and takes the humidity out of the air in the cabin. This cuts down
> on the ability of that air to condense on the cold windows. You probably
> don't have a working air-conditioner.
>
> Also, your car may have a small leak in the heater core that is dribbling
> some extra moisture into your cabin air. If ANY hot coolant is leaking out
> into the heater box, it will evaporate quickly and load the cabin air with
> water vapor.
>
> So, I'm suggesting two factors that might be present to explain your
> fogging problem.
>
> Now, if you want to test for fogging WITHOUT any people in the car, you
> will be better able to estimate how many problems you have.
>
> Just warm the car up and let it sit and run at idle for 15 minutes or so,
> with everything turned up the way you drive it.  If the system fogs up
> under ZERO people load, then I'd suspect a small heater core leak, or wet
> floorboards due to a water leak from the sunroof drain, or from a
> tail-light or trunk leak that is channeling water to the floorboards
somehow.
>
> Doyt Echelberger
> 87 5ktq